Recent model consensus from regional forecasts points to a nocturnal minimum near 21°C in Shanghai on October 13, driven by moderate northwesterly flow under building high pressure that limits radiative cooling while maintaining dew points around 16–18°C. Clear to partly cloudy skies overnight, combined with light winds under 5 m/s, support gradual temperature drops after sunset rather than rapid chilling typical of stronger cold advection. This positions the market-implied odds for 21°C and 22°C as closely matched outcomes, reflecting minor ensemble spread in boundary-layer mixing and urban heat retention. Historical October baselines show typical lows near 18°C, yet current steering patterns and lack of significant frontal passages have kept readings elevated, with any late-day observational revisions likely to refine the final recorded minimum.